Based on the conventional observations, NCEP reanalysis data and numerical test, water vapor transport characteristics of two local rainstorm processes in Yunnan on May 24, 2012 and September 27, 2015 are analyzed. The results show that:(1) The two processes are mainly affected by the subtropical high, the heavy rainfall and its water vapor transport are interrupted due to the extension of the subtropical high, the dynamic condition of the “5.24” process are mainly provided by the weather scale system, the dynamic condition of the “9.27” process is mainly used for the terrain uplift;(2) The water vapor sources of the both processes are the bay of Bengal, the South China Sea and the Western Pacific, the "5.24" process was dominated by water vapor transport in the southwest，the conveying distance is long，the "9.27" process was dominated by water vapor transport in the southeast, the conveying distance is short, the local characteristics are more significant;(3) "9.27" process’s water vapor flux and maximum rainfall are higher than that of "5.24" process, the correlation between water vapor flux and heavy rainfall is good, it has a certain indication significance for heavy rainfall;(4) The water vapor transport of the two processes was concentrated in the layer below 600hPa, the water vapor is mainly transported from meridional to southerly, the intensive time of water vapor transport is earlier than the beginning time of rainfall 48 to 72 hours;(5) The numerical simulation results are consistent with the conventional analysis, at the same time, the vertical transport characteristics of water vapor can be displayed, the lower layer is mainly southward, the number of middle-level southwest paths increased, there is a westward path above the middle level, there is a contribution of water vapor from the Indian peninsula and the Tibetan Plateau along the westerly belt.